Impacts of sanitation upgrading to the decrease of fecal coliforms entering into the environment in China

Area of Science:

• Environmental Science
• Public Health
• Water Quality

Background:

• Assessing sanitation efficacy is crucial for public health and environmental management.
• Fecal contamination poses significant risks, necessitating accurate estimation of sources and pathways.

Purpose of the Study:

• To estimate fecal coliforms (FC) entering the environment across 31 Chinese provinces.
• To evaluate the impact of different sanitation scenarios on FC release.
• To inform future sanitation strategies and public health risk assessments.

Main Methods:

• Estimation of fecal coliform (FC) releases under three distinct sanitation scenarios.
• Analysis of spatial distribution and regional disparities in FC contamination.
• Modeling the potential reduction in FC releases based on government sanitation targets.

Main Results:

• Current FC release is spatially disparate, with rural human waste dominating (over 90% of human releases).
• Livestock contribute FC releases of similar magnitude but with different spatial patterns.
• Achieving the 2020 sanitation target could decrease FC releases by 34% (12-54%).

Conclusions:

• Rural sanitation improvements are critical for reducing overall FC contamination in China.
• Targeted interventions in less developed regions like Tibet, Qinghai, and Ningxia are recommended.
• Enhanced sanitation and safe drinking water access are priorities for mitigating public health risks.